Arthropods form the largest and most varied assemblage of organisms on earth. They are important economically as agricultural pests, as vectors of disease and as a source of food. The study of their endocrine systems reflects their economic significance, most work having been carried out on insects, crustaceans and ticks. Knowledge in these areas has increased greatly in the last decade with the advent of improved techniques for the isolation and study of the hormones themselves, revealing fascinating relationships between the endocrine systems of the various arthropod groups. This volume brings together contributions from many of the leading workers in the field, providing in-depth accounts of the current state of knowledge of a wide range of hormone systems. The book presents a unique summary of some of the most significant and exciting advances of the last decade, brought together in a single volume for the first time.